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However, the only "hits" of value to us are unique "briefings" pulled within a 24hr period. I basically need to only have one instance of a record where the user_id and briefing_id are identical within 24hrs.

Don't have a clue how to get this done - advice appreciated as always!

Ok, so for each day you want only one istance of the same briefing_id and user_id right?
then this code might help, it might not be the best way to do it but at least it is the best I know of at the moment, it is not tested (rather hard to do so) but it might at least get you on the track.